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most are immigrants from el salvador and central america, many are undocumented. sessions says open borders and years of lax immigration enforcement has allowed ms-13 the thrive. >> the gang has gotten tougher. >> reporter: he is now promising more resources to local police and more deportations. >> we will identify these networks, investigate and build cases against them, then criminals who are convicted will be deported. >> reporter: in september two teenage best friends were beaten with baseball bats and hacked with machetes by ms-13. the mother of one of the victims welcomes sessions' visit. >> it's all about working together. if the federal and state can unite as one and figure out a solution, a plan -- >> reporter: suffolk county police say ms-13 continues recruiting in schools nationwide, targeting unaccompanied minors, undocumented children. >> this scourge is preying on immigrant communities in large part. so we, of course, want the

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